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Figure 4-10. Macro-level architecture of the Micro-Kernel pattern In Figure 4-10, you see four major functionalities: clients, adapter, micro-kernel, and external servers. The adapter is similar to the Adapter pattern presented in 5. For reference purposes, the adapter in this context has an additional functionality built in that borrows from the Fa ade pattern, which is discussed in 6. Within the micro-kernel box are two other boxes: functionality definitions and internal servers. The clients of Figure 4-10 are the consumers of the micro-kernel. The consumers interact with the micro-kernel using only the functionality offered by the adapter. The client won t have detailed knowledge of the inner workings of the micro-kernel. The micro-kernel defines the application logic and implements the infrastructure logic of the application. Defining the application means defining the interfaces, abstract base classes, and so on. Implementing the infrastructure logic of the application means to define how to load assemblies, process configuration information, and so on. The internal servers are the gopher classes for the micro-kernel. They are responsible for loading files, accessing the registry, retrieving GUI elements, and so on. The external servers implement the interfaces defined by the micro-kernel. An explicit reference to internal servers and external servers is included. Internal servers are pieces of implemented functionality needed by the micro-kernel to carry out the business logic, but aren t part of the micro-kernel, as the internal server isn t directly related to the micro-kernel. Adding the internal server to the micro-kernel would bloat the kernel. The external servers are pieces of functionality used indirectly by the client though the microkernel, which serves as a middle entity.

Figure 6-3. Plot of Raw values versus shaft angle The pot resistance value you buy depends on how many degrees of rotation your application requires. The 10k Raw values change almost linearly with angle, so if you were going to be marooned on a desert island, you d pack the 10k pot. However, picking the right resistance for your application greatly improves the angular resolution you ll get. The graph in Figure 6-4 shows the range of Raw values, given that you re only using the pots in their optimal range: 90 degrees for the 50k , 180 degrees for the 20k , and 270 degrees for the 10k .

Security updates should always be taken seriously and run when possible (see Figure 1-14). One unique aspect of the Apple Software Update preference pane is that security updates are always deployed independently from other updates. Security updates rarely force a restart of the computer and almost invariably contain a comprehensive description explaining what they fix and why they were written. Occasionally a software update will fail. When this occurs, it is possible for the update to become stuck in the software update cache. To clear these out or retrieve them, browse to the /Library/Caches/com.apple.softwareupdate/swcdn.apple.com folder, and find the update on your system. The update will be located in the folder with the corresponding month and date (see Figure 1-15). You can delete the update or run it again from this location. If the update is not located in these folders, then you should be able to run the Software Update feature and have it install again after a restart. You can also utilize this technique to save the update and burn it to optical media or a network drive for future installations.

In a nutshell, the idea of the micro-kernel is to create an architecture that can last for many application version numbers. What changes are the implementations of the individual pieces, but the contracts between the pieces remain for the large part identical. Important to realize is that each component can be changed independently without affecting the overall architecture. This is what makes the micro-kernel architecture so powerful and flexible.

Bluetooth is a globally unlicensed short-range radio frequency for wireless networks, also known as IEEE 802.15.1. In other words, Bluetooth is a wireless technology that provides a way to connect and exchange information between devices such as personal digital assistants (PDAs), mobile

The Bourns 3310C or 3310Y potentiometers make excellent angle sensors for the NXT. The 3310C in Figure 6-5 has three terminals on one side, whereas the 3310Y has them coming out the back in a triangle pattern. You should definitely solder your connections to these pots, or else the wires will pull off too easily. (Both these potentiometers can be purchased from Digi-Key in a variety of resistance values.)

Starting with a top-down analysis of the micro-kernel, the client interacts with the adapter, and the client has no detailed knowledge of the micro-kernel implementation This is done on purpose: a micro-kernel, internal server, and external server implement some functionality The functionality will use details such as lists, serialization, and association of types with each other To make the micro-kernel do anything useful, you need to assemble the individual functionalities This requires specific knowledge of the system, which the client shouldn t need To understand this, consider the following source code: class Math { public Decimal Addition( Decimal val1, Decimal val2 ) { return DecimalAdd( val1, val2 ); } } class SimplerMath { public int Add( int val1, int val2 ) { Math math = new Math(); return (int)(math.

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